您可能需要使用自定义阵列适配器自定义列表视图。例如,请参阅此link。
内容:
安卓HelloListView(http://developer.android.com/resources/tutorials/views/hello-listview.html)教程演示如何将ListView控件绑定到一个String对象的数组,但你可能会说长大很快。本文将向您展示如何将ListView绑定到自定义对象的ArrayList,并创建一个多行ListView。
比方说,您有某种搜索功能可以返回人员列表以及地址和电话号码。我们将为每个结果以三行格式显示数据,并使其可点击。
首先,创建您的新Android项目,并创建两个布局文件。 main.xml中可能已经被默认创建的,所以粘贴在:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_height="wrap_content"
android:text="Custom ListView Contents"
android:gravity="center_vertical|center_horizontal"
android:layout_width="fill_parent" />
<ListView
android:id="@+id/ListView01"
android:layout_height="wrap_content"
android:layout_width="fill_parent"/>
</LinearLayout>
接下来,创建一个名为custom_row_view.xml布局文件。此布局将成为ListView中每个单独行的模板。您可以使用几乎任何类型的布局 - 相对,表等,但对于这一点,我们就用线性:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:id="@+id/name"
android:textSize="14sp"
android:textStyle="bold"
android:textColor="#FFFF00"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView android:id="@+id/cityState"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView android:id="@+id/phone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
现在,添加一个对象调用SearchResult所。将此代码粘贴到:
public class SearchResults {
private String name = "";
private String cityState = "";
private String phone = "";
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setCityState(String cityState) {
this.cityState = cityState;
}
public String getCityState() {
return cityState;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getPhone() {
return phone;
}
}
这是我们将用我们的数据填充并加载到ArrayList中的类。
接下来,您需要一个自定义适配器。这只是扩展了BaseAdapter,但如果您愿意的话,您可以扩展ArrayAdapter。
public class MyCustomBaseAdapter extends BaseAdapter {
private static ArrayList<SearchResults> searchArrayList;
private LayoutInflater mInflater;
public MyCustomBaseAdapter(Context context, ArrayList<SearchResults> results) {
searchArrayList = results;
mInflater = LayoutInflater.from(context);
}
public int getCount() {
return searchArrayList.size();
}
public Object getItem(int position) {
return searchArrayList.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.custom_row_view, null);
holder = new ViewHolder();
holder.txtName = (TextView) convertView.findViewById(R.id.name);
holder.txtCityState = (TextView) convertView.findViewById(R.id.cityState);
holder.txtPhone = (TextView) convertView.findViewById(R.id.phone);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.txtName.setText(searchArrayList.get(position).getName());
holder.txtCityState.setText(searchArrayList.get(position).getCityState());
holder.txtPhone.setText(searchArrayList.get(position).getPhone());
return convertView;
}
static class ViewHolder {
TextView txtName;
TextView txtCityState;
TextView txtPhone;
}
}
(这与List14基本相同。Java API的演示)
最后,我们将在主类文件连线了这一切:
public class CustomListView extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
ArrayList<SearchResults> searchResults = GetSearchResults();
final ListView lv1 = (ListView) findViewById(R.id.ListView01);
lv1.setAdapter(new MyCustomBaseAdapter(this, searchResults));
lv1.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
Object o = lv1.getItemAtPosition(position);
SearchResults fullObject = (SearchResults)o;
Toast.makeText(ListViewBlogPost.this, "You have chosen: " + " " + fullObject.getName(), Toast.LENGTH_LONG).show();
}
});
}
private ArrayList<SearchResults> GetSearchResults(){
ArrayList<SearchResults> results = new ArrayList<SearchResults>();
SearchResults sr1 = new SearchResults();
sr1.setName("John Smith");
sr1.setCityState("Dallas, TX");
sr1.setPhone("214-555-1234");
results.add(sr1);
sr1 = new SearchResults();
sr1.setName("Jane Doe");
sr1.setCityState("Atlanta, GA");
sr1.setPhone("469-555-2587");
results.add(sr1);
sr1 = new SearchResults();
sr1.setName("Steve Young");
sr1.setCityState("Miami, FL");
sr1.setPhone("305-555-7895");
results.add(sr1);
sr1 = new SearchResults();
sr1.setName("Fred Jones");
sr1.setCityState("Las Vegas, NV");
sr1.setPhone("612-555-8214");
results.add(sr1);
return results;
}
}
请注意,我们首先得到SearchResult所对象的ArrayList(通常这会是从外部数据源...),将它传递给自定义适配器,然后设置一个点击侦听器。监听器获取被单击的项目,将其转换回SearchResults对象,并执行所需的任何操作。
感谢@thinksteep,我不得不通过它的外观和它适合我的代码,但我仍然得到错误 - '最终的ListView LV1 =(ListView控件)findViewById(R.id.list);' 这被设置为null,并抛出一个NullPointerException – Krath 2012-02-09 18:10:01
你扩展了listview吗?如果是这样,getlistview应该足够了。用最新的代码更新问题。 – kosa 2012-02-09 18:17:12
我认为我有 - 我已经遵循了一个单词的例子,但替换了你填充listview的位 - 我应该添加哪些代码来编辑? – Krath 2012-02-09 19:53:33